The title compound, C(15)H(13)N(3)O(4), was synthesized by the reaction of equimolar quanti-ties of 2-methoxy-benzaldehyde and 2-nitro-benzohydrazide in methanol. The dihedral angle between the two substituted benzene rings is 68.3 (2)°. In the crystal structure, inversion dimers linked by pairs of N-H⋯O hydrogen bonds occur.

In the title compound, C21H23ClN2O, the dihedral angle between the benzene rings is 83.2 (6)°, while the mean plane of the pyrazole ring [r.m.s. deviation = 0.043 (1) Å] makes dihedral angles of 3.4 (3) and 86.2 (1)° with the benzene rings. In the crystal, a pair of weak C-H⋯O inter-actions between the benzene ring and the propan-1-one group link the mol-ecules into an inversion dimer with an R...

In the title compound, C13H10N2O4, the nitro groups are twisted significantly relative to the benzene rings [dihedral angles = 16.64 (18) and 28.02 (11)°]. The benzene groups are nearly perpendicular to each other [dihedral angle = 87.72 (6)°]. Short inter-molecular N⋯O and C⋯O [2.981 (2) and 3.060 (2) Å, respectively] contacts suggest possible weak π-inter-actions between nitro groups and betw...

In the title compound, C14H12ClNO4S, the dihedral angle between the chloro- and meth-oxy-substituted benzene rings is 87.40 (1)°. In the crystal, adjacent mol-ecules form inversion-related dimers through strong N-H⋯O hydrogen bonds, generating R 2 (2)(8) loops. The dimers are further connected through two C-H⋯O inter-actions that form C(11) chains and R 2 (2)(14) loops. Aromatic π-π stacking in...

In the title compound, C(15)H(16)ClNO(2)S, the C-SO(2)-NH-C torsion angle is -61.15 (16)°. The sulfonyl and aniline benzene rings are tilted relative to each other by 38.8 (1)°. The crystal structure features inversion-related dimers linked by pairs of N-H⋯O hydrogen bonds.

In the title compound, [Fe(C(17)H(20)NO(2)Si)(2)], the Fe atom is situated on a crystallographic centre of inversion, leading to a perfectly staggered conformation of the Cp rings.

In the title compound, C(14)H(13)Cl(2)NO(2)S, the C-SO(2)-NH-C torsion angle is -71.4 (4)°. The sulfonyl and aniline benzene rings are tilted relative to one another by 44.6 (1)°. The crystal structure features inversion-related dimers linked by pairs of N-H⋯O hydrogen bonds.

In the approximately planar molecule of the title compound, C(11)H(8)N(4)O(4)S, the dihedral angle between the thio-phene and benzene rings is 5.73 (10)°. In the crystal structure, bifurcated inter/intra-molecular N-H⋯(O,O) hydrogen bonds are present. The intermolecular links lead to inversion dimers containing an R(2) (2)(12) graph-set motif.

In the title compound, C(14)H(9)ClN(4)O(5), the mol-ecule exists in a trans geometry with respect to the methyl-idene unit. The dihedral angle between the two substituted benzene rings is 62.7 (2)°. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds generate R(2) (2)(8) loops.

The title compound, C18H24N4, resides on a crystallographic inversion centre, so that the asymmetric unit comprises one half-mol-ecule. The piperazine ring adopts a chair conformation, with the mean planes of the two equatorial pyridine rings parallel to each other and separated by 2.54 (3) Å. No classical hydrogen bonds are observed.